A Mechanical Error Correction Algorithm for Laser Human Body Scanning System

Human body measurement involves large-scale measurement. The acquisition of three-dimensional spatial coordinate data is a complex process. The errors which are generated in each stage of the process can potentially affect the final measurement data. Therefore, the accuracy of measurement remains one of the key technical issues that influence the development of the three-dimensional human body scanner. On the basis of analyzing the parameters to be calibrated of the entire measurement system, calibration methods for the parameters of angle a and angle β were established. After analyzing errors of the laser human body scanning system, a mechanical error correction algorithm for the system was established. Then, a mechanical error correction experiment using a standard cylinder was designed, and the overall effect was analyzed. The correctness of the mechanical error correction algorithm was verified, which made the scanner more accurate. To further verify the accuracy and reliability of the measurement result when the system used human bodies as measured objects, a comparative experiment was designed. The results of the comparative experiment demonstrated that the absolute error of the system for 3D measurement of a large-sized human body is less than 2 mm, and the relative error is less than 1%, which can meet the needs of fields such as clothing design and production.